In a statement Thursday, Middlesex District Attorney Marian Ryan reiterated a statement from June 2013 in which she said Tsarnaev would face state charges in Collier’s death after his federal death penalty trial.
Tsarnaev is now on trial for the April 2013 bombing at the marathon finish line in which three people died and more than 260 were injured.
Collier was shot days after the explosions. Tsarnaev’s brother, Tamerlan, died later after a shootout with police.
Ryan says her office’s investigation into the shootout that gravely wounded transit Officer Richard Donohue should be complete within two months.